Rinse your cashews in a fine mesh strainer to remove any dust or dirt. Now add to a high powered blender, such as a Vitamix, with lemon juice, apple cider vinegar, nutritional yeast (if using), sea salt and filtered water.
Starting on a low speed start to blend, slowly working up to a high speed. You may have to stop and scrape down the sides with a spatula. If mixture is too thick, add more filtered water 1 Tablespoon at a time.
Using a high powered blender, such as a Vitamix, will help get a nice thick and creamy texture.